[BUG] parallel Bash calls get cancelled when grep returns exit code 1

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

grep 没匹配到内容时返回 exit code 1，框架把这个非零退出码当成了执行失败，连带把并行组里的另一个命令也干掉了。但 grep 返回 1 只是表示「没找到」，不是真报错。

What Should Happen?

parallel Bash calls get cancelled when grep returns exit code 1

Error Messages/Logs

Steps to Reproduce

parallel Bash calls get cancelled when grep returns exit code 1

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.126

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_